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Botanics. — Prof. J. W. Morr presents a communication of Miss 
T. TamMes at Groningen, entitled: ,Pomus in Pomo’’. 
By Professor C. A. J. A. OUDEMANS a monstrous apple was given 
to the Botanical Laboratory of the University of Groningen. This 
apple is originary from Dr. A. C. OUDEMANS, who got it acciden- 
tally in 1894, Within the apple is a second, quite loose from the 
external. In an added writing of MaxwerrL T. Masters he tells 
us, that he has often seen similar apples, but always the inner 
one joined to the external. 
In the literature of teratology we meet now and then with 
descriptions of cases where within a fruit a smaller one is found. 
The greater number of these cases relates to the genus Citrus; but 
the abnormality occurs with other plants also. 
So mention is made of some Cruciferae !), where the pod contains 
internally a smaller one; further, of so called fructus in fructu of 
Gentiana lutea *), Carica Papaya®*), Passiflora alata %), Passiflora 
Alpinia ®) and Piper nigrum *). Usually the communication is 
limited to one or mostly two cases; with the Citrus-species 5) 
on the contrary, the phenomenon is Ey no means rare. It seems 
to occur so often in this genus that double oranges are known in 
the Canaries by the name of „Narangas pregnadas”’ 6); whilst also 
at Nizza such fruits can be bought as „oranges doubles” 7). 
The descriptions of the internal fruit are not always in accordance 
with one another. In some cases the internal fruit has seeds, in 
others not. It is also described with and without a fruit-wall ; 
the phenomenon seems not always to be quite the same and of 
its explication relatively very little is known. 
The described apple is in alkohol and is here figured, in natural 
1) The Gard. Chron. 1882. Part L. p. 10 and p. 601. 
2) Bull. Soc. Botan. de France. 1878. p. 252. 
9) Flora Jahrg. 73, 1890. p. 332. 
4) B. Torr, B. C., vol. 18. New-York, 1891. p. 151. 
5) Jäcer, Ueber die Missbildungen der Gewachse 1814. p. 222, und Verh. Natur- 
hist. Ver. Rheinlande, 1860. p. 376. 
6) Hanausek, Z. Oest. Apoth. 1888, No. 16. 
7) Levende Natuur 1899 —1900. No. 2, 
