292 fBA OMENT8 OF SCIENCE. 
Here, however, are the titles of Mayer's papers, the 
perusal of which will correct any error of judgment into 
which I may have fallen regarding their author. "Be- 
merkungen iiber die Krafte der unbelebten Natur," Lie- 
big's " Annalen," 1842, Vol. 42, p. 231; "Die Organische 
Bewegung in ihrem Zusamtnenhange mit dem Stoffwech- 
sel/' Heilbronn, 1845; "Beitrage zur Dynamik des Him- 
rnels," Heilbronn, 1848; " Bemerkungen fiber das 
Mechanische Equivalent der Warme," Heilbronn, 1851. 
IN MEMOBIAM. Dr. Julius Robert Mayer died at Heil- 
broun on March 20, 1878, aged 63 years. It gives me 
pleasure to reflect that the great position which he will for- 
ever occupy in the annals of science was first virtually as- 
signed to him in the foregoing discourse. He was subse- 
quently chosen by acclamation a member of the French 
Academy of Sciences; and he received from the Royal 
Society the Copley medal its highest reward.* 
November, 1878. 
At the meeting of the British Association at Glasgow in 
1876 that is to say, more than fourteen years after its 
delivery and publication the foregoing lecture was made 
the cloak for an unseemly personal attack by Professor 
Tait. The anger which found this uncourteous vent dates 
from 1863, f when it fell to my lot to maintain, in opposi- 
tion to him and a more eminent colleague, the position 
whicli in 1862 I had assigned to Dr. Mayer. In those days 
Professor Tait denied to Mayer all originality, and he has 
since, I regret to say, never missed an opportunity, how- 
ever small, of carping at Maver's claims. The action of 
the Academy of Sciences and of the Royal Society sum- 
marily disposes of this detraction, to which its object, dur- 
ing his lifetime, never vouchsafed either remonstrance 
or reply. 
Some time ago Professor Tait published a volume of 
lectures entitled "Recent Advances in Physical Science," 
which I have reason to know has evoked an amount of cen- 
sure far beyond that hitherto publicly expressed. Many 
*See "The Copley Medalist for 1871," p. 479. 
f See " Philosophical Magazine " for this and the succeeding years. 
