PROFESSIONAL ADVANCEMENT COLUMN 



This column serves as a place in which it is possible for men to insert brief notices 

 with a view to securing positions or securing men, either in botany or any of its related 

 and applied branches. The identity of advertisers may be learned from the Editor of the 

 Plant World. Notices should not exceed 100 words. They will be inserted once for 50 

 cents, three insertions for $1.00. 



No. 11. A man having wide experience and training in museum and scientific work 

 seeks appointment as curator of a university or college museum. He is experienced in 

 the preparation of modern museum exhibits which seek to portray the life of animals 

 and plants as they occur in natural ecological groups. For a nimiber of years carried on 

 educational musemn extension work among the public schools of a large city. Would 

 also consider position in charge of a research museum in an educational institution 

 carrying on biological survey work, either scientific or economic, in both of which he 

 has had wide experience. Has published numerous scientific papers. 



No. 12. Botanist. Woman, Doctor of Philosophy of a leading university (1915). 

 Chief training in plant morphology and physiology; has also done work in zoology and 

 bacteriology. Has done research in cytology and physiology. The present year is being 

 spent in research. 



THE PLANT WORLD 



Tucson, Arizona 



PnTATTXir TAPTT7 foR equalizing the exposure 



iVU li\l lilVJ lilDL/ Hi OF A SERIES OF PLANTS ^ >i? 



This becomes an indispensable de- 

 vice in every physiological laboratory 

 after its first trial. It is impossible to 

 give equal conditions to all plants in a 

 standing series of cultures. For the 

 proper standardization of Atmometer 

 Cups it has been found absolutely nec- 

 essary. The table-top is circular, 4 feet 

 in diameter, of 5-ply wood, and is 

 mounted on a bicycle wheel, which is 

 supported on a heavy iron tripod base. 

 It is rotated by a belt from a reducing 

 gear, which is operated by a 1/20 H. P. electric motor or other sources of 

 power. A hot-air engine or small gas engine would also serve. A good speed 

 of rotation for most purposes is from 1/5 to 5 revolutions per minute. See Plant 

 World 15: 157-162, 1912; Physiological Researches 1 : 345- 1915. 



WEIGHT BEADY FOR SHIPMENT, ABOUT 150 LBS. 



Price of Rotating Table Complete, $30.00 

 Table Top Alone, $7.50; Tripod Base Alone, $8.50 



THE PLANT WORLD TUCSON, ARIZONA 



