Journal of Applied Microscopy. 375 



The method of investigation was to inject into the peritoneum of the cats of 

 various embryonic ages, Altmann's Uquid or sublimate. After half an hour the 

 spleen, stomach, and greater omentum were removed and put for an hour in the 

 same kind of fluid that was used for injection. Thorough washing in distilled 

 water was followed by staining in haematoxylin for a few minutes ; after more 

 washing it was allowed to remain in eosin for several minutes, and after washing 

 was brought on to a slide, stretched, and mounted in balsam, clearing in bergamot 

 oil. 



The author finds, in that part which lies between the curvature of the stomach 

 and the spleen, groups of erythoblasts similar to those found in other organs. 

 These erythoblasts become transformed into red blood corpuscles by the 

 extrusion of their nuclei. There are found among these cells, as in all centers 

 of similar growth, the characteristic " Riesenzellen " ; thus this author adds evi- 

 dence to the extrusion theory, in the disputed question concerning the fate of 

 the nucleus of the red blood cell. A. m. c. 



Levy, A. G. The Changes Occurring in the These experiments were performed 



Blood of Dogs after the Removal of the ^jj-j^ reference to microscopic and 



Thyroid. Jour. Path, and Bact., 5: No. 3, . . ^ 



pp. 316-330. chemical changes m the blood after 



the complete removal of thyroids and 

 parothyroids in dogs. In every case careful examinations were made of the blood 

 before operating, and time allowed for a complete recovery from the bleeding 

 necessary for the process. Estimates were made of the amount of haemoglobin 

 present, the number of red and white corpuscles, the specific gravity, the fibrin, 

 proteids, total solids, ash, and total nitrogen. Experiments were carried on 

 with twelve animals of various kinds and conditions. The author finds several 

 interesting results. It appears that the reduction in number of red and white 

 blood corpuscles is not a constant feature, and when ana:;mia does result its 

 degree is very uncertain. a. m. c. 



Morgan,!. H. A Confirmation of Spallanzani's As long ago as 1768 Spallanzani- 



Discovery of an Earthworm Regenerating a g^^^es that he found a species of earth- 

 1 ail m Place of a Head. Anat. Anz. 15: 



No. 21, pp. 407-410; 9 figs. worm in which a tail was regenerated 



instead of a head. Until now no cor- 

 roboration of this remarkable fact has been found, but Morgan describes in the 

 above article a clearly similar case. The experiments were carried on for five 

 months, and a number of worms cut in two at different distances from the 

 anterior end. Several of these regenerated a smaller part in every way similar 

 to a tail and showing a larger number of segments than the normal regenerated 

 head. Histological examination showed that the ventral nerve cord extended 

 to the end of the piece, and there was no evidence of a dorsal brain. Not only 

 was this evidence of its nature clear, but in the new segments, the nephridial 

 tubes opened in an opposite direction from those of the other part, and hence 

 proved the fact that the regenerated piece was a tail, and not as hitherto sup- 

 posed by the present author, as well as by earlier workers in such cases, an 

 undeveloped head end. a. m, c. 



