532 



Journal of Agricultural Research 



Vol. XIII, No. II 



Table III. — Penetration of materials as indicated by Sudan III , with trypan-blue 



method — Continued 



NONWETTING SOLUTIONS 



SOAP SOLUTIONS 



Ivory (i : 800). 

 Soft (i : 300). . 



Blue stain along some of the large tracheae 

 where red-stained soap solution pene- 

 trated. 



Blue stains along walls of red-stained 

 tracheae. 



VERY VOLATILE OILS AND ACIDS 



VOLATILE OILS AND ACIDS 



Butyric acid. 



Wood creosote 



Kerosene (230°-28o°) . 



Chlorbenzene 



40 minutes. 



30 minutes. 

 2 hours 



Blue stain along all particularly fine 

 tracheae. Red stain penetrated body 

 wall as in acetic acid. 



Blue stain along red-stained tracheae, par- 

 ticularly those to digestive tract. 



Blue stain along red-stained tracheae, par- 

 ticularly those to digestive tract. Blue 

 along some fine tracheae. 



Blue along red-stained tracheae. No blue 

 or very little beyond red stain. 



