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

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.

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$anrl when the colour is identical in the two compartments a and aJ, the percentage of ha?.mo- ^folrretip^a.d with no™a; Mood oa„ .e . e., ^^^J^Z^^^^S^^^^ cent, of the hsemoglobin of normal blood. [Bizzozero's chromocytometer is largely nsed in Italy for the same purpose.] The amount of hsenioglobin in man is 13-77 per cent., in the woman 12-59 per cent., during pregnancy 9 to 12 per cent (Prey er). According to Leichteii- stern, Hb is in greatest amount in the blood of a newly-born infant, but after ten weeks the excess disappears. Between six months and five years it is smallest in ^ amount; it reaches its second highest maximum between twenty- one and forty-five, and then sinks again. From the tenth year onwards, the blood of the female is poorer in Hb. The taking of food causes a temporary decrease Fig. 21. Fleischl's hffimometer. K, red coloured wedge of glass moved by R ; G, mixing vessel with two compart- ments a and a' ; M, table with hole to read oft the percentage of haemoglobin on the scale F ; i, to move K ; S, mirror of plaster of Pans. [In Animals.-The quantity of blood varies with the aiiimal investigated Table by Beaunis gives the proportion of hemoglobin per 100 gram, of blood of the Hb owing to the dilution of the blood. The followin; Man, Dog; Pig, Ox, Pathological.—A deci 12- 3 per 100. 13- 8 13-2 12-3 Sheep, Rabbit, Fowl, Duck, 11-2 per 100. ■5 •1 „1 vease is observable during recovery from febrile conditions, and also {Groll). 14 THE SPECTROSCOPE.-As the spectroscope is frequently used i^^he investigation of blood aTother substances, a ^^^^^^^^^ I consists of-(l) a tube, A, which has at Its p^^^^^^ ^^^^ its widened). At the other end a f.f or a lamp) pa es through the slit, and focus is in exact me w,^^^^^^ the parallel rays into a thus goes parallel ^^^^^^^ ^ to the spectrum r, ^, and rÄttSf ¥Xe'; SLf .^\Ähe inner e.ds of the three tubes are Zeis, .a, ^^^^^fjZ. tities of a solution are to be examined. \v-y sp~^ to g>ve two specha, .so^^^^^ the position of any absorption-band may be ^efin tely asce tameü i^^^ sp. iÄÄfobVe^Ä^^^^^ — *° ^ ^'Äaonlpectra._If a coloured medium (eg . solution of blood) placed b« the$