MEDICAL MICROSCOPICAL SOCIETY. 203 



on being detached, it leaves behind a concave depression. This 

 differs from the prevailing belief that multiplication takes place 

 by division of coloured nucleated corpuscles. The process repre- 

 sents a transition from endogenous formation to budding or 

 gemmation. 



Accumulations of blood-corpuscles were seen, beside in the 

 canals, in certain spaces limited by two layers of hexagonal cells, 

 forming a system of primary glandular follicles. The nuclei of 

 these hexagonal cells become the breeding- or mother-corpuscles 

 before mentioned. The author concludes that the primary birth- 

 place of the coloured blood-corpuscles in the human embryo is to 

 be sought in the above-described gland-like follicles of the umbi- 

 lical vesicle. This view differs, of course, entirely, as he admits, 

 from the older observations, as from the later of Klein and those 

 of Balfour published in this Journal last year. Further observa- 

 tions are given on the later development of the blood and on the 

 structure of the corpuscles, for which we must refer to the 

 original paper and plates published in the Society's journal. 



Another paper by the Rev. W. H, Dallinger, on " A Method 

 of Preparing Lecture Illustrations of Microscopic Objects " was 

 also read. 



Medical Microscopical Society. 



At the ninth ordinary meeting of the Medical Microscopical 

 Society, held at the Royal Westminster Ophthalmic Hospital, on 

 Friday, November 21st, Jabez Hogg, Esq., President, in the 

 chair ; the minutes of the previous meeting were read and 

 confirmed. 



Dr. Bruce described at some length the various methods of 

 studying inflammation. He considered that observing inflam- 

 mation in the frogs's foot was useless for two reasons : — 1. The 

 epithelial surface soon becomes dim with the action of reagents, 

 so as to obscure the vessels. 2. The vessels are not altogether suit- 

 able, and, besides, there is sometimes difiiculty in stretching the 

 web between the toes without interfering materially with the 

 circulation. 



He therefore preferred the mesentery — and recommended Hart- 

 nack's microscope — beginning the examination with a low power 

 and afterwards using Hartnack's No. 7 objective (equal to an English 

 quarter in magnifying power). The frog plate should consist of a 

 piece of glass with a cork (having a circular hole in the middle and 

 covered with a small cover of glass) cemented with sealing wax to the 

 one end of it. The mesentery is then pinned out upon the cork over 

 the glass. The frog should be injected with one minim of a |~ per cent, 

 solution of curare subcutaneously, because this paralyses all the 

 muscles except the heart ; then make an incision along the right 

 side of the body about an inch in length in a line with the leg and 



