76 COMMERCIAL FEEDING STUFFS. 



was a large amount of corn cockle present a much larger amount 

 than was found in any samples here reported. Other seeds which 

 are more or less poisonous are the jimson weed (Datura stramonium 

 L.) and the darnel (Lolium temulentumlu.). Fortunately the corn 

 cockle and jimson weed have very characteristic structures, by which 

 they can be readily identified, even though well ground. 



Special acknowledgments are due to Mr. F. H. Hillman and Dr. 

 C. F. Wheeler, of the Bureau of Plant Industry, who furnished a 

 standard collection of weed seeds of known identity for use in making 

 this study. 



MEDICINAL OR CONDIMENTAL MATERIALS. 



Substances of medicinal or condimental character which are some- 

 times found are as follows : 



OF VEGETABLE ORIGIN. 



Anise. Ginger. 



Asafetida. Hemp. 



Bayberry bark. Juniper berries. 



Black pepper. Licorice root. 



Blood root. Lobelia. 



Carob bean (St. John's bread). Mandrake. 



Capsicum. Oak bark. 



Coriander seed. Poplar bark. 



Elecampane. Senna. 



Fennel. Turmeric. 



Fenugrec. Valerian. 



Gentian root. Walnut bark. 



OF MINERAL ORIGIN. 



Alum. Potassium nitrate (saltpeter) 



Antimony. Rosin. 



Arsenic. Salt, common. 



Calcium carbonate. Salts, Glauber's. 



Calcium phosphate. Salts, Epsom. 



Charcoal. Sodium carbonate. 



Coperas. Sulphur. 

 Iron oxid. 



HISTOLOGICAL FEATURES OF SOME CATTLE-FOOD CONSTITUENTS. 



A description of the histological features of some of the most 

 common ingredients of cattle foods, and also of some of the inmv 

 important of our common weed seeds, is given in the following dis- 

 cussion. Many others, such as corn, barley, oats, etc., are not dis- 

 cussed, as they are amply treated in the literature of the subject. 



WHEAT AND RYE. 



In products containing seed coats of these grains the histological 

 features of the cross cells are sufficient to identify them. These cells 



