456 Hctrtog . — The Alleged Fertilization 
the great improbability of Hartog’s theory.’ Professor Trow 
is singularly unfortunate in his illustration. Between such 
widely different groups as the Metazoa, and the Phaeophyceae, 
it was hardly to be expected that homologies could be found ; 
yet, thanks to his own teacher, Oltmanns, we know that the 
abortive oospheres of the Fucaceae are absolutely comparable 
with the polar bodies of the Metazoa. 
Professor T row’s careless treatment of facts and records 
shows everywhere save in his figures. Thus whilst he figures 
the well-known cellulin-corpuscles of Pringsheim (Fig. 42), 
he not only fails to recognize them, but volunteers an 
absolutely impossible explanation of their nature ; ‘ occasion- 
ally, as represented in the figure, we have in the large central 
vacuole what we may regard as skeletons of fat-globules ; 
these skeletons are very delicate spherical shells, almost 
invisible in some preparations, but generally well seen in those 
stained with haematoxylin (p. 157) . . . The oil-globules are 
represented by the cavities in which they lay, and occasionally, 
in the case of those lying either partly or wholly in the 
vacuole, by the skeletons we have already described ’ (p. 158). 
In ’95 I noted that the cellulin-granules become almost 
invisible in balsam, and what Professor Trow calls shells are 
certainly (as he figures one in Fig. 43) solid spheres of this 
substance ; that it stains with haematoxylin, was, so far as 
I remember, one reason for my rejecting that pigment. He 
throws doubt (p. 166) on the validity of my preparations, for 
representing in my Figs. 21, 22, oospores of Achlya , the outer 
part occupied by dense protoplasm, ‘ the central part appears 
in the form of a big vacuole, the nucleus being suspended in 
the middle by fine strands of protoplasm’ ; yet in both these 
a thin continuous layer of protoplasm is figured surrounding 
the nucleus. I am far from being a good draughtsman, and my 
sketches were unfortunately redrawn instead of being printed 
in their inartistic condition. But in Fig. 25, that of the spore 
of Saprolcgnia with two unequal nuclei not yet fused, the 
larger nucleus especially has a dense investment of cytoplasm, 
continuous with the reticulum. 
