Permit me through your columns to thank Prof. Sargent for his frank disavowal of any thought of claiming for his friend, Col. Clark, more than was his due. To explain how his words implied anything else, I would refer him, in addition to the sentence in which he alleges he is "made to claim by inference," to the beginning of the next paragraph of his communication in your January issue, where he remarks that "some of Col. Clark's other introductions," etc. These words certainly convey the idea that he had introduced what had been previously mentioned.

Prof. Sargent apparently makes a distinction between the words "introduced " and "first introduced." I can readily understand that if a plant has been at any time introduced into another country and afterwards lost, it may be reintroduced, or introduced a second time, but "introduction" certainly implies "first introduction," or else it is not an introduction at all. An additional number of the same thing at a later period would not be fairly expressed by the word.

It gives me more pleasure to respond, as far as in me lies, to Prof. Sargent's request for information concerning the Cercidiphyllum than having a war of words. Let me first remark on its correct orthography. Referring to "Miquel's Florae Japonicae," fol. 804, I find it is spelled as above, and not Cercidophyllum. It is one of the largest growing deciduous trees in Japan; sparsely inhabiting, as far as has come under my observation the interior mountain ranges of Nippon and of the island of Yesso. In this respect it is, with some few other examples of arboreal vegetation peculiar, the straits which separate the two islands, making a wide division in their flora. Being at home in so cold a region it would be expected to be hardy in our latitude, as it has proved to be with the single specimen I sent to my home. Seeing it only while journeying through the country, and at a season of the year when not in flower, I am unable to describe its peculiarities in that respect. Neither am I aware that its timber has any special value for building or in the manufacture of articles of household use.

I concur, however, with Prof. Sargent in considering it as giving good promise of a deciduous tree of the first importance, and congratulate him on receiving a supply of seed of it, as hitherto it has proved a refractory subject for other methods of propagation.