1875.] Aerial Locomotion. 251 
emphasise our other statement, ‘‘ that Professor Marey has 
done scant justice to Dr. Pettigrew. 
This is the more evident, as we are given to understand 
that Dr. Pettigrew’s original memoirs and papers were duly 
transmitted to Professor Marey immediately after their pub- 
lication. 
From the foregoing, it will be evident that Professor 
Marey has added comparatively little to the science of 
Aérostation. He has, for the most part, simply confirmed 
by experimental methods, in which he is an adept, Dr. Pet- 
tigrew’s original observations and experiments, published 
nearly two years before his own experiments were under- 
taken. 
Professor Marey is certainly not entitled to say, as he 
does at p. 187, that “‘ notwithstanding this apparent agreement, 
our theory and that of Dr. Pettigrew differ materially from each 
other.” 
Still less is he entitled, virtually, to appropriate Dr. Pet- 
tigrew’s descriptions and figures, without full and fair 
acknowledgment. Least of all is he entitled to modify and 
misrepresent those descriptions and figures. 
Such practices sap the foundation of science. 
