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achieved have proved the complete adap- tability of armored cement to marine construction. Although a boat so built is somewhat heavier than if wood were employed, it has the compensating ad- vantage of being far more economical to maintain. Construction itself can be car- ried out as rapidly if not more expedi- tiously as in either wood or metal. Re- searches have shown the tenacity of the adherence of the cement to iron; and Signor Gabellini has carried out several experiments in this direction himself. In his laboratory he erected a small me- chanical apparatus supporting a block of cement . about <3. ino . Square; an 'TAE Marine REVIEW which was inbedded a section of round iron rod such as he uses in his system. A weight of 1,320 pounds was suspended from the iron rod, the object being to force it away from the cement, but al- though the strain was applied continu- ously for three months, no evidence of separation was observable, and the block 53 was found as perfect and as intact as the day upon which it was made. The question naturally arises as to the capability of such a structure to with- stand such shocks as pounding against piers and other craft. Tests in this di- rection have conclusively proved that. although the fabric has great rigidity, yet THE PONTOONS WHICH SUPPORT THE FLOATING BOATHOUSE, FLOATING CHALET OF REINFO RCED CONCRETE FOR THE ANIENE ROWING CLUB ON THE TIBER.