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secured good tubers on aerial branches in the dark, but only 

 unusually fleshy sprouts in very diffuse light. 



The accompanying illustration (Figure i) is from a photograph 

 of a specimen found growing in the conservatoiy of the New 

 York Botanical Garden. It is customary here, as in many green- 

 houses, to place pieces of " potato " on the soil of the potted 

 plants to protect the plant from snails and slugs. The potato, 

 being more accessible, is eaten and the plant spared. 



Fig. I. Solaniiin tubtros7int. Tuber-formation on aerial shoot in light. 



In the humid atmosphere of the glass house these pieces of 

 potato readily sprout, and a few weeks ago the specimen here 

 illustrated was found, growing in sufficient light to develop 

 abundant chlorophyll in the cortex. 



The entire specimen, including the piece of the seed tuber, 

 had been constantly above the surface of the soil, and exposed 

 to rather strong illumination. As will be seen from the picture, 

 the sprout that bears the new tuber sprang from an "eye " near 

 the apical end of the seed-tuber, and is somewhat abnormally 

 short and fleshy. A few of the leaves at the nodes of the young 

 green tuber show a slight differentiation into petiole and blade, 



