1897J MICROSCOPICAL JOURNAL. 231 



stained on one half of the smear, leaving- the other half 

 unstained, in whieh measurements of a g-ivcn number of 

 corpuscles, taken as they come, from each part, g"ive iden- 

 tical results. C. M. Vokck. 



Crystals in Blood Corpuscles of Frog. — I have a slide 

 prepared by the process of the late lamented Allen Y. 

 Moore, M. D. The blood was spread on slide, and dried; 

 flowed with aqueous sol. of eosin, and washed; flowed with 

 aqueous sol. of methyl blue, and washed, dried, and moun- 

 ted in balsam. 



The blood of fishes, fro^s, and perhaps other reptiles, 

 often exhibits crystals apparently within the corpuscles 

 when simply dried without staining-. This has been 

 noticed by many observers. 



These elliptically formed crystals are not in the same 

 plane as the corpuscles, and seem to be on the cover-g-lass. 

 It is the custom of some to cleanse the covers in an acid 

 solution, and then rinse in alcohol. If this was done, the 

 cause of the crystals being- there mig-ht be from an insuffi- 

 cient washing- after the acid bath. If a few drops of a sat- 

 urated solution of an}- of the salts in water be dropped 

 into a little alcohol, the salt immediately crystallizes into 

 individual crystals such as are seen in this mount. I have 

 had slides showing- crystallization in film so thin as to be 

 seen only by polarized lig-ht, which I attributed to an insuffi- 

 cient washing- after soaking- in a cleansing- bath of borax 

 solution ; and I believe that if they had been rinsed in alco- 

 hol it would have produced individual cr\^stals and not a 

 thin iilm. Thos. J. Brav. 



Larvae of Clothes Moth. — These larvae are ver}^ small 

 at first ; the body is white and soft, ancl seems to need the 

 protection of the tube or case which it builds from the 

 woolen fibres cut small a.nd cemented tog-ether. My spe- 

 cimens were taken from a fancy worsted crocheted mat, of 

 no earthly use, and consequently somewhat neg^lected; the 

 dyed wool^as utilized by the insect makes a pleasing- object. 

 The six anterior feet of the larvae are strong- and can drag- 

 the caterpillar and its case along- in this fashion : the bod}- 



