"To remove this obstacle I repeat or refer to such knowledge as has come under my notice, my own previously expressed views, and also describe and exhibit my last experiments and explain their novelty and utility"

Lawrence Hargrave is referring to the requirement to get rid of an obstacle in order to progress. He is suggesting that he will use the knowledge he has actually gotten, his own previously expressed views, and his last experiments to discuss the novelty and utility of his work. This suggests that he is confident in his work and thinks that it will be helpful to the progress of the project. He is likewise recommending that he will use his own experiences and knowledge to explain the value of his work and how it can be utilized to overcome the barrier. This quote reveals that Lawrence Hargrave is a positive and experienced person who is willing to use his own experiences and knowledge to help advance the job.