An introduction to medical literature, including a system of practical nosology : intended as a guide to students, and an assistant to practitioners / by Thomas Young.

  • Thomas Young
Date:
1813
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to medical literature, including a system of practical nosology : intended as a guide to students, and an assistant to practitioners / by Thomas Young. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

    57/622 page 27
    II. APHORISMS RELATING TO CLASSIFICATION, EXTRACTED PRINCIPALLY FROM THE PHILOSOI'HIA BOTANICA OF UNNe'. CHAPTER VI. OJ generic characters. §. 151. The foundation of methodical science consists of two parts, arrangement and nomenclature. 152. Arrangement is either theoretical, relating to classes, orders, and genera, or practical, relating to species and varieties. 153. Arrangement or method is either syrfoptical or syste- matic. 154. A synopsis depends on arbitrary divisions, proceeding in pairs at each step, and is not admissible in botany, except as a key or index. 155. A system proceeds in its arrangement by five steps j classes, orders, genera, species, and varieties. A synopsis in 5 steps extends only to 32 varieties ; a systens may comprehend 100 000, if each division contains 10 members. 156. System is the Ariadnean thread, without which all is confusion. 157. Species in natural history are supposed to have been originally created distinct. 158. Varieties may be as numerous as the individuals which have been produced. [It is however only such varieties, as are in some measure hereditary, that require to be particularly noticed.] 159. Genera are determined in botany from the agreement of the parts of fructification.
    digitised image 1
    digitised image 2
    digitised image 3