1900] MICROSCOPICAL JOURNAL. 129 



This method proved very successful in the laboratory 

 of Purdue University, and was used in studying five dif- 

 ferent forms of corpuscles. They were those of the cat, 

 the 01, the pigeon, the chicken, and man. The human cor- 

 puscles were the only ones which resisted the stains, but 

 this diflBculty wa» overcome by the use of a vreak solution 

 of acetic acid. Besides making the stains eflFective, it also 

 clears the films considerably. Although this method may 

 be of no chemical value it promises to be successful for 

 general laboratory purposes. — Ind. Acad. Sci. 



Notes on Microscopy. 



F. SHIIvIvINGTON SCALES, F.R.M.S. 



How TO Obtain and Keep Gtreqarinid^. — Inadequate 

 instructions are given in most text-books on the matters of 

 this sort, directions such as, ''Take a drop of water con- 

 taining amcebsB," &c., reminding one of the reputed old 

 cookery-book instruction : "First catch your hare." Gre- 

 garinidsB may be found, "more or less abundantly," usu- 

 ally less so when you come to look for them, in the intes- 

 tines of insects and of other invertebrates. But in the 

 alimentary canal of the yellow jointed lavae of Tenebrio 

 molitor they may be found at all times, and in abundance. 

 This is the black beetle found in granaries, mills, barns, 

 &c. Its larvae, commonly known as meal-worms, and oft- 

 en erroneously called wire-worms, may be found in abun- 

 dance in flowering mills, feed-stores, under boards and 

 bags that have lain for several months, or under feed- 

 boxes in stables — anywhere, in fact, where good grain is 

 stored. The best time is when repairs are being made in 

 a neighboring mill." The larvfe may be kept for an in- 

 definite time, without further attention, by simply plac- 

 ing them in glass or stone jars with plenty of the grain 

 debris in which they are found, occasionally adding more 

 meal, dry-rotten wood or rags. At certain times of the 

 year they are apt to metamorphose rapidly if too well fed, 



