Almond as Source of the A Vitamin. 



39i 



plete regeneration. All fragments which continue to divide contain 

 both macro- and micronuclear material. It has been impossible to 

 produce an amicronucleate race by artificial means. 1 



In Spathidium, where the two nuclear elements extend through- 

 out the cell both during and after fission, there is no difference in 

 the regenerative power at any peroid of asexual life. In Blepha- 

 risma, however, where large amacronucleate fragments maybe 

 obtained during the process of division, it has been found that 

 temporary restoration of external organelles is possible in the 

 absence of nuclear material, if the formation of a new peristome 

 has already been started. Dedifferentiation immediately follows 

 and death occurs in a few days. The presence of micronuclei in 

 such fragments, moreover, is not sufficient for continued existence. 



During conjugation, complete regeneration in Spathidium is 

 less frequent than during asexual life. Portions containing the 

 synkaryon regenerate and divide; other pieces remain unchanged 

 or undergo only temporary restoration of form. Fragments ob- 

 tained from starved Spathidia prior to encystment either fail to 

 regenerate, or regain normal form and subsequently encyst. 



192 (1939) 

 The almond as a source of the A vitamin. 



By MARY SWARTZ ROSE and GRACE MACLEOD. 



[From the Department of Nutrition, Teachers College, Columbia Uni- 

 versity, New York City.} 



Investigations by Cajori have shown that the almond fur- 

 nishes proteins adequate for growth, reproduction, and the suck- 

 ling of young, and the B vitamin in liberal amounts. 2 Coward 

 and Drummond have reported an experiment on three rats, of 

 fourteen days' duration, in which one gram per day of almond 

 was added to a basal ration devoid of the A vitamin, which indi- 

 cates that this amount of nut does not furnish a sufficient supply 

 of A vitamin for growth of albino rats, 3 but so limited an experi- 



1 Woodruff and Spencer, Journ. Exper. Z00L, 1922, Vol. 35. 



2 Cajori, Jour. Biol. Chem., 1920, xliii, 583-606. 



3 Coward and Drummond, Biochemical Journal, 1920, xiv, 665. 



