Relazione annuale dei coltivatori di frutta " Associazione di Ontario, 1898 . s del sig. Henry e Crampton, Jr., di theDepartment di zoologia dell'Università di Columbia, sono nel superamento di interesse.fr-^Mr. La Crampton, seguendo gli esperimenti del sig. G. nato su rana e toadembryos, determinato a provare esperimenti simili nell'innesto su Lepidoptera nel pupalperiod e ha ottenuto alcuni davvero meravigliosa risultati il sig. Crampton selezionato il pupaeof la grande Saturnians, Cynthia peltata, Promethea e Polifemo come essendo il mostsuitable, sebbene egli ha anche sperimentato con successo su Vanessa Antiopa, ma non ha avuto alcun

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Annual report of the Fruit Growers' Association of Ontario, 1898 . s of Mr. Henry E Crampton, Jr., of theDepartment of Zoology of Columbia University, are of surpassing interest.fr-^Mr. Crampton, following up the experiments of Mr. G. Born upon frog and toadembryos, determined to try similar experiments in grafting upon Lepidoptera in the pupalperiod and has obtained some truly marvellous results Mr. Crampton selected the pupaeof the large Saturnians, Cynthia, Cecropia, Promethea and Polyphemus as being the mostsuitable, though he also experimented with success upon Vanessa Antiopa, but had nosuccess in his operations upon Danais Archippus. ENTOMOLOGICAL SOCIETY. 23 ^.-_u The butterflies are not so well suited to these experiments as these large moths, partly because of their status being higher than that of the moths, and in the case of thosewhich winter either in the larval or imago state, the chrysalis period is too short. i&£7Naturally, failure resulted in a good many cases, the average of successful operationsamounting to about ten per cent.. Fig. B. Operation of the second category. Union in Tandem of P. Cynthia, anterior, and C. Prometheaposterior. The operations were of great variety, the anterior end of one pupa being joined tothe posterior end of another either of the same or of a different species, or they werejoined in tandems or in pairs back to back, while in one case the tip of the abdomen ofone moth was grafted to the upper side of the abdomen of another. One pupa had hadits head cut off and was still alive and the abdomens of some were cut off about the mid-dle to see if any regeneration would take place. No cases have been successful wherethe division has been made longitudinally through the centre of the pupae, and the nearerthis line is approached the fewer there are which are successful, and conversely the lessthat is taken off the more likely are the subjects to survive. The modus operandi is to slice the pupse with a razor and effect the junct

Parole chiave associate all'immagine

• bookcentury1800
• bookdecade1890
• bookida
• booksubjectfruitculture