Volume 1

A text-book of human physiology : including histology and microscopical anatomy with special reference to the requirements of practical medicine / by L. Landois ; translated from the seventh German edition with additions by William Stirling.

  • Landois, L. (Leonard), 1837-1902. Lehrbuch der Physiologie des Menschen. English
Date:
1891
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of human physiology : including histology and microscopical anatomy with special reference to the requirements of practical medicine / by L. Landois ; translated from the seventh German edition with additions by William Stirling. Source: Wellcome Collection.

    59/602 (page 19)
    19 against the attack of certain microbes, immunity (§ 166).] a chemical as distinguished from vaccinal III. Blood-Plates.—Special attention has recently been directed to a third element of the blood, the blood-plates, blood-platelets, or blood-tablets of Bizzozero (figs. 17 and 18); pale, colourless, oval, round, or lenticular discs of variable size (mean 3 fx). In a healthy man Fusari found 18,000 to 250,000 in 1 cubic millimetre of blood. These blood-plates may be recognised in the circula- ting blood of the mesentery of a chloralised guinea-pig and the wing of the bat. 1 ® \ 5 Fig. 17. Blood-plates and their derivatives. 1, a red blood-corpuscle on the flat; 2, on the side ; 3, unchanged blood-plates ; 4, lymph-corpuscle, surrounded by blood-plates ; 5, altered blood- plates ; 6 lymph-corpuscle with two heaps of fused blood-plates and threads of fibrin ; 7, ?f fibnn blood-plates ; 8, small group of partially dissolved blood-plates with fibrils They are precipitated in enormous numbers upon threads suspended in fresh shed blood [or if blood be beaten with a linen thread]. They may be obtained from blood tiowmg directly from a blood-vessel, on mixing it with one per cent, solution ot osmic acid. They rapidly change in shed blood (fig. 17, 5), disintegrating, forming small particles, and ultimately dissolving. When several occur together they rapidly unite, form small groups (7), and collect into finely granular masses, ihese masses may be associated in coagulated blood with fibrils of fibrin (fig. 17). r..iSH'Sf^?°.°fF^f T ^' '^^^ b^°«d of the guinea-pig, especially if it be J olt Etfnl 1 ('P- 1022) or I per ceSt. NaCl tinged with methvl- Trfl; ,^^%^f^°;^g^rdsthem agents which immediately induce coagulation and take Lcrib^he i^Sf f°l1- during coagulation of the blood ; Eberth and Schimmelbusch from^^i,. Iv According to Lowit they are formed tKcocv fZ ^'^'^^'^ leucocytes as a consequence of alteration of the blood. Along with knolrto J^SÄ .^^ the formation of fibrin (mava). These structure! were them hLäbIa.t^ their significance has been variously interpreted. Hayem called of rLne^atLt of U If ^^^^ ^'^''^'^^ pregnancy, Afanassiew in conditions TAf ?n ft Vi ?i°°?' ^''^'^ ^^^''^^ ' they are diminished in fever. Piuchet tW ^^'k' ^^'^ ^^^^ the - globules of Donn,^ by SbednmWtLT' some confusion, for both coloured and colourless granules a/e iToTred oornn^^^ ^^^^'^^^ P^^'^aps, parts of disintegrated descXd Sv^Ä 7 'I ^-'^^ blood-plates. The - invisible blood-corpuscles rff frnt« L^? ? '™P^y decolorised red corpuscles (Hart, Gibson).] ^ thirdto tL ^ h rlf^'ii '^I^^' leading to active blood-formation, it is stated that on the S sfme oWviY «i mitotic division of the blood-platelets are to be seen (Mondino). howeverW sü!l%^b\t^^^^^^^ blood-platelets. These obUrvatioiJ,