Bargain Lots of Cacti 



No. 1 Four Species $1.00 



Including Mamillaria, Echinocereus, Platopuntia, and Cylin- 

 dropuntia. 



No, 2 Four Species of Opuntia $1.00 



Not duplicating the above; and including two Platopuntias 

 and two Cylindropuntias. 



No. 3 Four Species $2.50 



Contains no Opuntias and no duplicates with Lots 1 and 

 2. Includes Cereus giganteus. 



No. 4 Twelve Species $4.00 



Being a combination of the above three lots. 



No. 5 Twelve Species of Opuntia $4.00 



Comprising Lot 2 and eight other species, including Opuntia 

 Bigelovii. 



No. 6 Twenty Species $10.00 



A fine diversified lot and a great bargain. Includes Cereus 

 giganteus, Echinocactus Wislizeni and Echinocereus rigid- 

 issimus. 



THE PLANT WORLD, TUCSON, ARIZONA 



Automatic Transpiration Apparatus 



The apparatus devised by Dr. E. N. Transeau for the graphic recording of 

 transpiration rate has been placed in our hands for sale. This apparatus was 

 described and illustrated in Botanical Gazette, Vol. 52, pp. 54-60. 



Full particulars and prices on application. 



THE PLANT WORLD, TUCSON, ARIZONA 



Special Clearance Sale of Back Numbers 



Five back numbers of The Plant World, of our own choosing, will be sent post 

 free for 60 cents. Our regular price would be $1.50. The issues available for 

 this offer are generously illustrated, and especially rich in articles on plant 

 geography, ecological botany, and travels, not to mention a wide range of 

 other subjects. Any preference of the purchaser for particular numbers, or 

 for a particular class of articles, will be honored as far as possible. 



THE PLANT WORLD, TUCSON, ARIZONA 



