The following notices of Mr. Anderson-Henry's article, p. 159, have appeared 
in the ' Gardeners' Chronicle,' July 27 and August 3, 1872. 
"In the ' Gardeners' Chronicle' for May 18 (p. 671), a communication to the 
Scientific Committee of the Royal Horticultural Society is printed, detailing the 
results of crossing the Pyrenean Arabis Soyeri with the North- American A. hle- 
pharojphylla. The most important point was the extreme divergence exhibited 
by the second generation of plants from both their hybrid parent and the 
original species of which it was a cross. Having carefully examined the 
specimens which accompanied the paper, I can hardly refrain from suspecting 
some error. The plants of the second generation have been submitted to 
three experienced botanists ; and all have pronounced them without a moment's 
hesitation to be our indigenous A. hirsuta. This agrees with my own opinion ; 
and it would be desirable to know, therefore, whether there is any possibility of 
the seed of the hybrid having been infertile, and of the indigenous Arabis having 
come up accidentally in its place." 
W. T. Thiselton Dyer. 
" I have to thank Professor Thiselton Dyer for his notice and, I must add, 
correction of my communication to the Scientific Committee of May 18th last. 
Having plenty of the seedlings which he and other scientific botanists had 
pronounced to be Arabis hirsuta, I have submitted a specimen to Professor 
Balfour, who very kindly compared it with dried specimens in his herbarium ; 
and he having concurred in opinion, I cannot for a moment believe that he and 
they can be in error. Neither can I believe that I had, by the crossing opera- 
tions detailed, reproduced A. hirsuta. But as I am most careful to avoid mis- 
takes, and allow no gardener to interfere in such matters, I am at a loss to 
account for the mistake. I rather think, however, that it originated, not in the 
second generation, as Professor Dyer supposes, but in the first, and in that one 
of the "three or four" original plants which had attained, as I stated, a height 
of 18 inches. But it rather increases my difiiculty how to account for a seed of 
Arabis hirsuta finding its way into the hybrid seed-pot, when I had not in my 
collection or within my grounds, so far as known to me, a single plant of that 
species. But happening to have by me still some of the seeds of the original 
monster seedling, I have sown them to-day, and shall be happy to report if any 
thing different comes from them." 
I. Andersox-Henry. 
July 29. 
