14 Journal of the ^Mitchell Society [September 



Some Phases of Structure and Development of Garden Pea and White 

 Siveet Clover Seeds as Related to Hardness. L. E. Yocum. 

 Appears in full in this issue. 



Notes on the Reproduction of Hydra in the Chapel Hill Region. H. S. 

 Everett, 

 Appears in full in this issue. 



Dormancy in Seeds of Persimmon (Diospyros virginiana). H. L. 



Blomquist. 



A preliminary report on an investigation in germinating seeds of 

 persimmon, showing that there is a marked period of dormancy under 

 both natural and artificial germinating conditions. The length of 

 this period has not been definitely determined but seems to extend 

 over two to several years, depending upon the physical, chemical, 

 and biological conditions of the soil and upon the location of the 

 seed and the variation in its structure. The main cause of the delay 

 in germination has been found to be due to a layer of the seed 

 covering which caps the radicle and exerts a certain amount of 

 resistance to the expansion of the embryo and a decrease in water 

 absorption. By removing this cap one hundred per cent germina- 

 tion was secured with seeds collected in the autumn from mature 

 fruit. 



Som,e Investigations into the Bacteriology of Common Colds and an 

 Autogenous Vaccine Therapy for Six Months at Wake Forest Col- 

 lege. W. L. Taylor and Charles Phillips. 



In the fall of 1921 bacteriological cultures were made from the 

 noses or throats of 25 persons having fresh colds. Growth was 

 made in dextrose blood broth and on dextrose blood agar plates, re- 

 action Ph 7.2, the broth tubes incubated anaerobically and the plate 

 aerobically. Incidental saprophytic bacteria were largely ruled out 

 by this method. The organisms identified and obtained in pure cul- 

 ture wore: Stapht/lococcus alhus and aureus, B. Mucosus capsulatus 

 (Priediander), Streptococcus hemohiticus and viridans type. Micro- 

 coccus tetragenus and catarrhalis, Pneumococcus t.ypes 2 and 4, B 

 influenza, and two strains of Diphtheroids. Several strains of most 

 of these were obtained. A polyvalent vaccine of these was made and 

 standardized to contain 1000 million per cc. Tliis was given by the 

 usual tcchnicjuc liypddcrniicjilly every 4-.") days in tliese doses, .2occ, 



