in2 Journal of Applied Microscopy 



not only result in more healthy bodies for our pupils and in a more healthful 

 community, but it should contribute largely to broaden and deepen the mental 

 life of the student. James E. Peabody. 



The Peter Cooper High School, New York City. 



Biology Wall Charts. 



"A Method of Making Biology Wall-Charts," by F. D. Heald of Parsons 

 College, Fairfield, Iowa, published in the Journal of Applied Microscopy 

 for November, 1900, induces me to speak of a method of chart making which I 

 have adopted with considerable satisfaction, to myself at least. 



The method is not original with me, but was suggested by Prof. H. P. Johnson 

 of the University of California. My charts are made of material such as. is used 

 by " millers " for the manufacture of flour sacks. It is well known that this sack 

 muslin has incorporated in the meshes of the cloth a filling of paste material 

 which renders the surface smooth and very suitable to draw upon. Instead of 

 a pen I use an ordinary paint brush of suitable size and shape. My pigments 

 are such as painters use for the ordinary canvas advertising streamers and are 

 procured ready mixed at the paint shop at a cost of a few cents. With these 

 materials, charts of all sizes, colors, and kinds may be readily made. I find 

 these " home-made " charts more satisfactory in my classes than any others that 

 I have heretofore used, as there can be represented upon them exactly what it 

 is wished to illustrate. These charts are so inexpensive and so easily made that 

 any school may provide itself with a sufficient number for illustration in 

 Physiology, Zoology, Botany, and other subjects. As they are made in water- 

 colors, when not in use they should be kept in a dry place. 



Orson Howard. 

 University of Utah, Salt Lake City. 



Staining in Toto with Delafield's Haematoxylin. 



The stain is prepared according to the method found in Ruber's " Directions 

 for Work in Histological Laboratory," p. 153; except that, before using, it is 

 diluted with an equal amount of distilled water, instead of five to ten times with 

 water, as according to the directions. 



The specimens, which should not be of too great size — not more than 

 one-fourth inch in thickness — are left in the stain five days. After rinsing in 

 water they are decolorized for two hours in acid alcohol made as follows : 



Hydrochloric Acid, . . . . .1 part 



Alcohol, 06 per cent. . . . .70 parts 



Water, . . . . . .30 parts 



They are then washed in running water for at least two hours to remove all 

 the acid. Dehydrate, and imbed in paraffin. Newton Evans, M. D. 



American Medical Missionary College. 



