50 



SCIENCE. 



[N. S. Vol. II. No. 28. 



Systemic : general : Chemical substances; 

 about 3,000 slips. 



There is, I tliink, a certain amount of 

 novelty in the mode of grouping under this 

 heading, but it would occupy too much space 

 to draw any further attention to this fea- 

 ture. Under this heading each substance 

 found in the bodies of animals has its own 

 set of slips. Particulars are entered bear- 

 ing upon its chemical composition, chemical 

 constitution, the processes of formation (ac- 

 tual and hypothetical), the changes which 

 it undergoes in the animal body, and (in a 

 general way) its modes of occurrence in 

 the different systems of organs. The full 

 details are given in connection with each 

 organic system. 



Under Systemic: General; there are also 

 grouped, the notes relating to Development, 

 Cells and their differentiated parts, each 

 part having its own set of slips. Chondroites, 

 Cilia, Animal Magnetism, Animal Electricity, 

 and a few other minor subheadings; these 

 cover about 100 slips. Absorbent System ; 

 this covers about 250 slips, and is broken 

 up into various subheadings subordinate to 

 Lacteal and Lymphatic Subsystems. Alimen- 

 tary System; about 1,500 slips. Each parti- 

 cular part has its own set of slips. Under 

 Bile each chemical substance found therein 

 has a special set of slips devoted to it ; at 

 present there are 65 such substances dealt 

 with in the notes. Under Food, also there are 

 a number of subordinate headings : Circu- 

 latory System, about 1,200 slips. Generative 

 System ; about 200 slips. Glands; about 700 

 slips. Mxiscular System; about 500 slips. 

 Nervous System; about 900 slips. Osseous 

 System; about 800 slips. Resinratory System; 

 about 300 slips. Senses; about 500 slips. 

 Tegumentary System ; about 300 slips. Tissues; 

 about 500 slips. Urinary System ; about 600 

 slips. Habits; about 150 slips. Medial In- 

 fluence; about 3,200 slips. Geological Distri- 

 bution ; about 2,500 slips. This is arranged 

 by periods, and under each period there 



are separate sets of slips for each country 

 or subdivision of a country, such as 

 county, etc. Geographical Distribution; 

 about 400 slips. 



The whole number of slips relating to 

 animals regarded from a general point of 

 view is about 27,000. 



Each class of animals has separate treat- 

 ment, the facts being mostly groujaed to- 

 gether under the main headings above 

 enumerated for animals in general, subor- 

 dinated to the name of each genus. 



Notes have been collected more or less 

 fully under most of the classes, so that few 

 comprise less than 5,000 or 6,000 slips, while 

 some comprise a great manj^ more than that. 



The notes under some of the non-zoologi- 

 cal subjects are also more or less bulky. 

 Thus Stratigrapjhy, Minerals (including chem- 

 ical substances). Ocean, Water and some 

 others each exceed 30,000 slips. 



The slips I use measure eight inches by 

 five inches, and are arranged in book boxes 

 lettered on the back with the name of the 

 subject-matter in the box. Each slip is 

 headed with all the main and subordinate 

 headings appertaining to it and numbered. 

 By taking care that the size is kept uniform 

 there is little risk of the edges being turned 

 back, of the corners being dog-eared, or of 

 the surfaces becoming dusty or soiled. 

 They have all the advantages of cards, oc- 

 cupy much less space and are more easily 

 handled, as each book box is the size of a 

 thick octavo volume. 



In conclusion, I wish to thank j'ou for 

 allowing me to occupy so much of your 

 space. A. Eamsat. 



London. 



hack tuke memorial. 

 The great respect in which the late Dr. 

 D. Hack Tuke was held bj' all who knew him 

 has led to a verj^ generally expressed desire 

 that his memor}' should by jjerpetuated in 

 connection with the great \\ork to which 



