26 , THE AMERICAN MONTHLY [Feb 



printers and annoyance to authors would thereby be 

 avoided. 



Bones. — The Luetgert trial suggests to our workers to 

 investigate and if possible discover what, if any, histo- 

 logical differences exist between human and animal bones. 

 The analogous bones should be compared. Thin sections 

 of the bones should be examined. Bones are comparative- 

 ly soft and sections may be rapidly made. A measure- 

 ment of the average sizes of lacunae, canaliculi and of 

 the concentric lamellse around the Haversian canals might 

 he productive of good results. 



Cartilage. — Sections of different kinds of cartilage 

 make interesting slides. There are numerous points to 

 be studied. For instance hyaline cartilage, costal carti- 

 lage, . the capsule, the lacunae, fibro-cartilage, yellow or 

 elastic cartilage. 



Fats. — Nearly all fats contain crystals that will polar- 

 ize beautifully. Most fats are true salts composed of an 

 organic or fat acid united to a base. To see these crys- 

 tals, place a minute piece on a slide and cover, press on 

 the cover and spread out to a thin film. 



After the first examination, heat the covered slide 

 enough to melt the enclosed fat. After it cools, the crys- 

 tals will form and rearrange themselves. A knowledge 

 of these crystals is useful in the detection of adultera 

 tions. 



Subscription Price. — It will be one dollar for 1898 if paid 

 directh" to the publisher in advance or during- the present 

 month. We authorize no ag^ents. Those who wait, or 

 pay throug-h self-appointed agents, bookstores, etc. should 

 pay two dollars out of which the intermediaries and pub- 

 lisher may take payfor their services. 



Slides. — W. White, 2 Rick street, Notting-ham, Eng-land, 

 offers cabinet of 72 slides for 21 shillingfs. 



