182 IOWA ACADEMY OF SCIENCES. 



York the past season. The colorless mycelium creeping over 

 the surface sends small rounded suckers (haustoria) into the 

 epidermal cells, and produces numerous colorless erect hyphae 

 (conidiophores) that bear the spores (conidia) in chains. The 

 conidia germinate in a short time by producing a short thread. 

 They may often be found germinating on the plant. These 

 spores serve to propagate the fungus during the summer 

 •while the spores found in the brown perithecia tide the fungus 

 over the following spring. As a result of the attacks of this 

 fungus the leaves become dry and so far as their function is 

 concerned, that of assimilating food, are entirely worthless. 

 As stated from the quotation from Professor Galloway they 

 are unfit for budding. 



Treatment. — Professor Galloway has shown that ammon- 

 iacal carbonate of copper will effectually prevent the disease, 

 and I may add that inasmuch as Bordeaux mixture has proved 

 so effectual on the college grounds in holding in check the 

 powdery mildew of the cherry, it may prove efficacious for 

 this disease, and we advise the use of this fungicide in prefer- 

 ence to ammoniacal carbonate of copper. 



QUINCE FRUIT WITH AN IMMENSE NUMBER OF 



SEEDS. 



BY L. H. PAMMEL. 



Several years ago there was brought to me a quince, Pyrus 

 cydonia, containing much more than the usual number of seeds. 

 The genus Pyrus has from two to five ovaries and in each 

 ovary are two ovules. Bailey in the revised edition of " Gray's 

 Field, Forest and Garden Botany''* states that the five cells 

 are normally many seeded. In the case under consideration 

 the fruit had a perfectly normal appearance of five cells and 

 over one hundred seeds. They are show a in the accompany- 

 ing illustrations. 



♦161. 



