448 NEW JERSEY AGRICULTURAL COLLEGE 



while the poor soil produced 25 long-styled and 29 short-styled 

 plants. So far as these two tests go there is evidence that high man- 

 uring produces an excess of the long-styled, and poor soil an excesss 

 of the short-styled, form. 



But plants from the same lots of mixed seed grown in sand gave 

 quite different results — that is, the greatest excess of the long-styled 

 form was from seed grown in ordinary soil and sown in nearly pure^ 

 sand. 



In the experiments in growing the third generation from the long- 

 styled and short- styled seed, the results ran as follows : 



Long-styled. Short-styled. 



Long-styled seed 12 11 



Short-styled seed 9 13 



This indicates that there may be a tendency lor the mother form 

 to exert some control over the form in the offspring. If this is a fact 

 it might be possible, by constant selection, to do away with one or the 

 other form. 



SPRAYING EXPERIMENTS IN GREENHOUSE. 



Only a limited amount of spraying was done other than for the 

 destruction of insect enemies. However, a test was made to check 

 the powdery mildew upon some of the ornamental plants, in particu- 

 lar the phlox, verbena and roses. The broad-leaved plantain (Plan- 

 tago Rugellii), grown in the greenhouse for another purpose, proved 

 to be a fine subject for this work, first, because the plants are very 

 susceptible to the mildew-^, and secondly, the leaves are large, well 

 disposed for treatment and quite lasting. 



The sprayings were made with a small apparatus, that produced a 

 fine mist, and the plants were treated once in ten days. Several sub- 

 stances were used, but, as florists object to any discoloration, clear 

 liquids were chiefly employed. 



One of the mixtures used is the kerosene emulsion, made according 

 to the following formula : Kerosene, two pints ; ivory soap, one 

 ounce, and water, eight gallons. 



Upon the pholx, verbena and plantain this soon began to show 



* The species upon the phlox, verbena and plantain, growing close together, was 

 probably Erysiphe cichoracearum D C, and of the roses, Spharotheca hwnuli D C, but 

 as it did not fruit the determination is not made, and is not essential to the results 

 of the experiment. 



